Tunneling the Wajue Mines

From publisher blurb: The methane gas, which powers the large steampunk cities below the Wajue desert, has started depleting at a rapid pace. Many of the containers housing the methane reserves have been hijacked from a nearby storage facility. The shortage of this natural resource has driven up its value exponentially, especially on the Malin-run black market. Can you track down the missing fuel before the cities of the Wajue are forced to power down?